On this day: January 7

2012: Katy Perry's album "Teenage Dream" becomes the first album in history to have seven songs from the same album reach No. 1 on the Billboard Hot Dance Club Songs chart. This was official as soon as the single "The One That Got Away" hit No. 1. The previous six singles to reach No. 1 on the chart were "California Gurls," "Teenage Dream," "Peacock," "Firework," "E.T." and "Last Friday Night (T.G.I.F.)."

Galileo spots some of Jupiter's moons, the Harlem Globetrotters play their first game, Truman announces the development of the H-bomb, and President Clinton's impeachment trial begins, all on this day.